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Several lanes of lanes of southbound I-5 near I-90 were blocked Monday morning after a dump truck overturned onto the roadway, spilling gravel and diesel fuel.

Diesel fuel leaked from the overturned truck onto freeway and caught on fire. Firefighters arrived at the scene and quickly put out the fire.

Seattle firefighters say the driver of the truck suffered minor injuries.

Several lanes were shut down for a couple of hours and traffic was backed up several miles. By 9:45 a.m. the southbound I-5 collector distributor lanes had reopened to relieve some of the congestion. The main freeway lanes remain closed; it's unknown when the lanes would reopened.

The express lanes remain southbound to help with traffic flow until further notice.

WSDOT advised drivers to avoid southbound I-5 through downtown Seattle and to take alternate routes, such as SR 99, I-405 and Airport Way.

No official word yet what caused the truck to overturn.

MORE: Check traffic conditions

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